PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1347–1352 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000

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XV Portuguese Conference on Fracture, PCF 2016, 10-12 February 2016, Paço de Arcos, Portugal Thermo-mechanical modeling of a high pressure turbine blade of an airplane gas turbine engine P. Brandão a , V. Infante b , A.M. Deus c * a Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal b IDMEC, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal c CeFEMA, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal Abstract During their operation, modern aircraft engine components are subjected to increasingly demanding operating conditions, especially the high pressure turbine (HPT) blades. Such conditions cause these parts to undergo different types of time-dependent degradation, one of which is creep. A model using the finite element method (FEM) was developed, in order to be able to predict the creep behaviour of HPT blades. Flight data records (FDR) for a specific aircraft, provided by a commercial aviation company, were used to obtain thermal and mechanical data for three different flight cycles. In order to create the 3D model needed for the FEM analysis, a HPT blade scrap was scanned, and its chemical composition and material properties were obtained. The data that was gathered was fed into the FEM model and different simulations were run, first with a simplified 3D rectangular block shape, in order to better establish the model, and then with the real 3D mesh obtained from the blade scrap. The overall expected behaviour in terms of displacement was observed, in particular at the trailing edge of the blade. Therefore such a model can be useful in the goal of predicting turbine blade life, given a set of FDR data. ECF22 - Loading and Environmental effects on Structural Integrity Fatigue crack propagation initiated at artificially made small defect in two different HAZ microstructures Fidan Smaili a , Tomaž V uhe r a * a University of Maribor, Faculty of Mechanical Engineering, Smetanova ulica 17, 2000 Maribor, Slovenia Weld joints consist of base material, heat affected zone (HAZ) and weld metal. Load carrying capacity of the weld joints depends on the weakest rt of the microstructure i welded joint, esp cially at cyclic loading. Weld joint usually an consist small defects, which are much smaller of sensitivity of NDT methods for weld joint inspection. In those cases, small cracks often initiated from such defects, so the size of the defect in comparison to grain size is very important for early crack propagations. Defects and cracks originating on such condition can be declared as “microstructurally small” (smaller than grain) or “physically small” (size of just few grain) or long one (size 10 or 100 grains or more). Crack initiation from such defect and its early propagation are very different. Crack initiation and early crack propagation from artificially made defect (28 µm deep) by Vickers indenter were analyzed. Investigation reviled that threshold for FG HAZ is smaller than for the CG HAZ, but crack propagation in CG HAZ is higher in comparison to FG HAZ. Some cracks, which had been initiated, stopped to propagate in CG HAZ but in case of FG HAZ they propagated without stopping. © 2018 The Authors. Published by Elsevier B.V. Peer-review und r responsibility of the ECF22 organizers. Keywords: Weld joint; HAZ; defect; crack initi tion; crack propagation Nowadays welding process is becoming one of the most significant and cost effective manufacturing processes. Heat is generated by arc between electrode and base material. Filler material and part of base material melt into weld pool and they affect to base material in wider zone which is not melted but is subject of significant microstructural changes known as heat affected zone (HAZ). HAZ is very heterogenic and complex zone and it is divided into sub- © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Fatigue crack propagation initiated at artificially made small defect in two different HAZ microstructures Fidan Smaili a , Tomaž V uherer a * a University of Maribor, Faculty of Mechanical Engineering, Smetanova ulica 17, 2000 Maribor, Slovenia Abstract Weld joints consist of base material, heat affected zone (HAZ) and weld metal. Load carrying capacity of the weld joints depends on the weakest part f the microstructure in welded joint, especi lly at cyclic loading. Weld joint usually can consist small def cts, which ar much smaller of s nsitivity of NDT m thods for weld joint inspection. In those cases, sm ll cracks often initiated from such defects, so the size of the defect in comparison to grain size is very importa t for early crack propagations. D fects and cracks originating on such condition can be de lared as “microstructurally small” (smaller than grain) or “physically small” (size of just few grai ) or long one (size 10 or 100 grains or more). Crack initiation from such d fect and its early ropagation are very different. Crack initiation and early crack propagation fr m artifi ially made defect (28 µm deep) by Vickers indenter were analyzed. Investigation revile that threshold for FG HAZ is smaller than for the CG HAZ, but crack propagation i CG HAZ is higher in comparison to FG HAZ. Some cracks, which had been initiated, stopped to propagate in CG HAZ but in case of FG HAZ they propagated without stopping. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of th ECF22 organiz rs. Keywords: Weld joint; HAZ; defect; cr ck initiation; cra k rop gation 1. Introduction Nowadays welding process is becoming one of the most significant and cost effective manufacturing processes. Heat is generated by arc between electrode and base material. Filler material and part of base material melt into weld pool and they affect to base material in wider zone which is not melted but is subject of significant microstructural changes known as heat affected zone (HAZ). HAZ is very heterogenic and complex zone and it is divided into sub- © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Abstract 1. Introduction

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer review under r sponsibility of the ECF22 organizers. * Corresponding author. Tel.: +386-2-220-7677; fax: +386-2-220-7990. E-mail address: tomaz.vuherer@um.si * Corresponding author. Tel.: +386-2-220-7677; fax: +386-2-220-7990. E-mail ad ress: tomaz.vuherer@um.si

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016.

2452-3216  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 10.1016/j.prostr.2018.12.282